Syntax Tree (RubyKaigi)

Syntax Tree is a new toolkit for interacting with the Ruby parse tree. It can be used to analyze, inspect, debug, and format your Ruby code. In this talk we'll walk through how it works, how to use it in your own applications, and the exciting future possibilities enabled by Syntax Tree.

Transcript

1. Syntax Tree
2. Kevin Newton @kddnewton
3. Syntax Tree
4. Build a syntax tree Syntax Tree
5. Build a syntax tree Format the syntax tree Syntax Tree
6. Build a syntax tree Format the syntax tree Create a CLI Syntax Tree
7. Build a syntax tree Format the syntax tree Create a CLI Create a language server (LSP) Syntax Tree
8. Build a syntax tree Format the syntax tree Create a CLI Create a language server (LSP) Translate the syntax tree Syntax Tree
9. Build · Format · CLI · LSP · Translate Syntax Tree
10. Build a syntax tree Build · Format · CLI · LSP · Translate
11. Define each node Build · Format · CLI · LSP · Translate
12. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end
13. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end Named fields
14. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end Named fields #location/#comments
15. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end Named fields #location/#comments #accept/#child_nodes
16. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end Named fields #location/#comments #accept/#child_nodes #deconstruct/ 
 #deconstruct_keys
17. Build · Format · CLI · LSP · Translate class VCall < Node attr_reader :value, :location, :comments def initialize(value:, location:, comments: []) @value = value @location = location @comments = comments end def accept(visitor) visitor.visit_vcall(self) end def child_nodes [value] end alias deconstruct child_nodes def deconstruct_keys(keys) { value: value, location: location, comments: comments } end end Named fields #location/#comments #accept/#child_nodes #deconstruct/ 
 #deconstruct_keys Immutable
18. Define each node Build · Format · CLI · LSP · Translate
19. Ripper::EVENTS.count # => 190 Define each node Build · Format · CLI · LSP · Translate
20. Ripper::EVENTS.count # => 190 SyntaxTree::Node.descendants.count 
 # => 162 Define each node Build · Format · CLI · LSP · Translate
21. Ripper::EVENTS.count # => 190 SyntaxTree::Node.descendants.count 
 # => 162 qwords_new/qwords_add -> SyntaxTree::QWords Define each node Build · Format · CLI · LSP · Translate
22. How we use ripper Build · Format · CLI · LSP · Translate
23. var_ref : user_variable { /*%%%*/ if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$); /*% if (id_is_var(p, get_id($1))) { $$ = dispatch1(var_ref, $1); } else { $$ = dispatch1(vcall, $1); } %*/ } | keyword_variable { /*%%%*/ if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$); /*% %*/ /*% ripper: var_ref!($1) %*/ } ; Build · Format · CLI · LSP · Translate
24. var_ref : user_variable { /*%%%*/ if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$); /*% if (id_is_var(p, get_id($1))) { $$ = dispatch1(var_ref, $1); } else { $$ = dispatch1(vcall, $1); } %*/ } | keyword_variable { /*%%%*/ if (!($$ = gettable(p, $1, &@$))) $$ = NEW_BEGIN(0, &@$); /*% %*/ /*% ripper: var_ref!($1) %*/ } ; Build · Format · CLI · LSP · Translate
25. class Foo def bar baz end end Build · Format · CLI · LSP · Translate
26. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
27. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
28. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
29. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
30. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
31. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
32. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
33. class Foo def bar baz end end Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
34. Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) [:class, [const, superclass, bodystmt]] end def on_def(name, params, bodystmt) [:def, [name, params, bodystmt]] end end
35. Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_kw(value) = @stack << [:@kw, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) kw = @stack.rfind { |token| token in [:@kw, "class"] } [:class, [@stack.delete(kw), const, superclass, bodystmt]] end def on_def(name, params, bodystmt) kw = @stack.rfind { |token| token in [:@kw, "def"] } [:def, [@stack.delete(kw), name, params, bodystmt]] end end
36. Build · Format · CLI · LSP · Translate class Parser < Ripper def on_const(value) = [:@const, value] def on_ident(value) = [:@ident, value] def on_kw(value) = @stack << [:@kw, value] def on_const_ref(const) = [:const_ref, const] def on_vcall(ident) = [:vcall, ident] def on_class(const, superclass, bodystmt) kw = @stack.rfind { |token| token in [:@kw, "class"] } [:class, [@stack.delete(kw), const, superclass, bodystmt]] end def on_def(name, params, bodystmt) kw = @stack.rfind { |token| token in [:@kw, "def"] } [:def, [@stack.delete(kw), name, params, bodystmt]] end end
37. Build · Format · CLI · LSP · Translate -> (positional; local1, local2) {}
38. Build · Format · CLI · LSP · Translate -> (positional; local1, local2) {} range = (location.start_char + 1)...location.end_char locals = lambda_locals(source[range]) Paren.new( lparen: params.lparen, contents: LambdaVar.new( params: params.contents, locals: locals, location: location ), location: params.location, comments: params.comments )
39. class Foo def bar baz end end Build · Format · CLI · LSP · Translate
40. Build · Format · CLI · LSP · Translate class Foo # comment def bar baz end end
41. Build · Format · CLI · LSP · Translate class Foo def bar # comment baz end end
42. Build · Format · CLI · LSP · Translate class Foo def bar baz # comment end end
43. Build · Format · CLI · LSP · Translate # comment class Foo def bar baz end end
44. Build · Format · CLI · LSP · Translate class Foo # comment def bar baz end end
45. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end
46. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ ]
47. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ # comment1, ]
48. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ # comment1, # comment2, ]
49. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ # comment1, # comment2, # comment3, ]
50. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ # comment1, # comment2, # comment3, # comment4, ]
51. Build · Format · CLI · LSP · Translate # comment1 class Foo # comment2 # comment3 def bar # comment4 baz # comment5 end end [ # comment1, # comment2, # comment3, # comment4, # comment5 ]
52. Build · Format · CLI · LSP · Translate [ # comment1, # comment2, # comment3, # comment4, # comment5 ] (program (statements ((class (const_ref (const "Foo")) (bodystmt (statements ((void_stmt), (def (ident "bar") (params) (bodystmt (statements ((vcall (ident "baz")))))))))))))
53. Build · Format · CLI · LSP · Translate (program (statements ((comment "# comment1"), (class (const_ref (const "Foo") ((comment "# comment2"))) (bodystmt (statements ((void_stmt), (comment "# comment3"), (def (ident "bar") (params ((comment "# comment4"))) (bodystmt (statements ((vcall (ident "baz") ((comment "# comment5"))))))))))))))
54. Walking the tree Build · Format · CLI · LSP · Translate
55. Build · Format · CLI · LSP · Translate class Visitor def visit(node) node&.accept(self) end def visit_child_nodes(node) node.child_nodes.map do |node| visit(node) end end end
56. Build · Format · CLI · LSP · Translate class VCall < Node def accept(visitor) visitor.visit_vcall(self) end end class Visitor def visit(node) node&.accept(self) end def visit_child_nodes(node) node.child_nodes.map do |node| visit(node) end end end
57. Build · Format · CLI · LSP · Translate class VCall < Node def accept(visitor) visitor.visit_vcall(self) end end # Visit an ARef node. alias visit_aref visit_child_nodes # Visit an ARefField node. alias visit_aref_field visit_child_nodes # Visit an Alias node. alias visit_alias visit_child_nodes # Visit an ArgBlock node. alias visit_arg_block visit_child_nodes # Visit an ArgParen node. alias visit_arg_paren visit_child_nodes # Visit an ArgStar node. alias visit_arg_star visit_child_nodes # Visit an Args node. alias visit_args visit_child_nodes # Visit an ArgsForward node. alias visit_args_forward visit_child_nodes # Visit an ArrayLiteral node. alias visit_array visit_child_nodes # Visit an AryPtn node. alias visit_aryptn visit_child_nodes # Visit an Assign node. alias visit_assign visit_child_nodes # Visit an Assoc node. alias visit_assoc visit_child_nodes # Visit an AssocSplat node. alias visit_assoc_splat visit_child_nodes # Visit a Backref node. alias visit_backref visit_child_nodes class Visitor def visit(node) node&.accept(self) end def visit_child_nodes(node) node.child_nodes.map do |node| visit(node) end end end
58. Build · Format · CLI · LSP · Translate class VCall < Node def accept(visitor) visitor.visit_vcall(self) end end alias visit_vcall visit_child_nodes # Visit a VoidStmt node. alias visit_void_stmt visit_child_nodes # Visit a When node. alias visit_when visit_child_nodes # Visit a While node. alias visit_while visit_child_nodes # Visit a WhileMod node. alias visit_while_mod visit_child_nodes # Visit a Word node. alias visit_word visit_child_nodes # Visit a Words node. alias visit_words visit_child_nodes # Visit a WordsBeg node. alias visit_words_beg visit_child_nodes # Visit a XString node. alias visit_xstring visit_child_nodes # Visit a XStringLiteral node. alias visit_xstring_literal visit_child_nodes # Visit a Yield node. alias visit_yield visit_child_nodes # Visit a Yield0 node. alias visit_yield0 visit_child_nodes # Visit a ZSuper node. alias visit_zsuper visit_child_nodes # Visit an EndContent node. alias visit___end__ visit_child_nodes class Visitor def visit(node) node&.accept(self) end def visit_child_nodes(node) node.child_nodes.map do |node| visit(node) end end end
59. Build · Format · CLI · LSP · Translate class RegexpVisitor < Visitor def visit_regexp_literal(node) # do something with regexp literal node here node.options # call super to continue walking the tree super end end
60. Build · Format · CLI · LSP · Translate class JSONVisitor < Visitor def visit_aref(node) node(node, "aref") do field("collection", node.collection) field("index", node.index) comments(node) end end def visit_aref_field(node) node(node, "aref_field") do field("collection", node.collection) field("index", node.index) comments(node) end end def visit_alias(node) node(node, "alias") do field("left", node.left) field("right", node.right) comments(node) end end
61. Format the syntax tree Build · Format · CLI · LSP · Translate
62. Algorithm Build · Format · CLI · LSP · Translate
63. prettyprint Algorithm Build · Format · CLI · LSP · Translate
64. prettyprint Build group, text, breakable to layout content Algorithm Build · Format · CLI · LSP · Translate
65. prettyprint Build group, text, breakable to layout content Break outermost groups to fit to print width Algorithm Build · Format · CLI · LSP · Translate
66. Build · Format · CLI · LSP · Translate [foo1, foo2, [bar1, bar2, bar3, bar4], foo3, foo4, [baz1, baz2]]
67. Build · Format · CLI · LSP · Translate [foo1, foo2, [bar1, bar2, bar3, bar4], foo3, foo4, [baz1, baz2]]
68. Build · Format · CLI · LSP · Translate [foo1, foo2, [bar1, bar2, bar3, bar4], foo3, foo4, [baz1, baz2]]
69. Build · Format · CLI · LSP · Translate [ foo1, foo2, [bar1, bar2, bar3, bar4], foo3, foo4, [baz1, baz2] ]
70. Build · Format · CLI · LSP · Translate [ foo1, foo2, [bar1, bar2, bar3, bar4], foo3, foo4, [baz1, baz2] ]
71. Build · Format · CLI · LSP · Translate [ foo1, foo2, [ bar1, bar2, bar3, bar4 ], foo3, foo4, [baz1, baz2] ]
72. breakGroup([group([text(["["]), indent([breakable, text(["foo1", ","]), breakable, text(["foo2", ","]), breakable, group([text(["["]), indent([breakable, text(["bar1", ","]), breakable, text(["bar2", ","]), breakable, text(["bar3", ","]), breakable, text(["bar4"])]), breakable, text(["]"])]), text([","]), breakable, text(["foo3", ","]), breakable, text(["foo4", ","]), breakable, ... Build · Format · CLI · LSP · Translate
73. breakGroup([group([text(["["]), indent([breakable, text(["foo1", ","]), breakable, text(["foo2", ","]), breakable, group([text(["["]), indent([breakable, text(["bar1", ","]), breakable, text(["bar2", ","]), breakable, text(["bar3", ","]), breakable, text(["bar4"])]), breakable, text(["]"])]), text([","]), breakable, text(["foo3", ","]), breakable, text(["foo4", ","]), breakable, ... Build · Format · CLI · LSP · Translate
74. breakGroup([group([text(["["]), indent([breakable, text(["foo1", ","]), breakable, text(["foo2", ","]), breakable, group([text(["["]), indent([breakable, text(["bar1", ","]), breakable, text(["bar2", ","]), breakable, text(["bar3", ","]), breakable, text(["bar4"])]), breakable, text(["]"])]), text([","]), breakable, text(["foo3", ","]), breakable, text(["foo4", ","]), breakable, ... Build · Format · CLI · LSP · Translate
75. breakGroup([group([text(["["]), indent([breakable, text(["foo1", ","]), breakable, text(["foo2", ","]), breakable, group([text(["["]), indent([breakable, text(["bar1", ","]), breakable, text(["bar2", ","]), breakable, text(["bar3", ","]), breakable, text(["bar4"])]), breakable, text(["]"])]), text([","]), breakable, text(["foo3", ","]), breakable, text(["foo4", ","]), breakable, ... Build · Format · CLI · LSP · Translate
76. breakGroup([group([text(["["]), indent([breakable, text(["foo1", ","]), breakable, text(["foo2", ","]), breakable, group([text(["["]), indent([breakable, text(["bar1", ","]), breakable, text(["bar2", ","]), breakable, text(["bar3", ","]), breakable, text(["bar4"])]), breakable, text(["]"])]), text([","]), breakable, text(["foo3", ","]), breakable, text(["foo4", ","]), breakable, ... Build · Format · CLI · LSP · Translate
77. I made too many additions to prettyprint Build · Format · CLI · LSP · Translate 😅😅😅
78. prettyprint Build · Format · CLI · LSP · Translate
79. prettier_print Build · Format · CLI · LSP · Translate
80. Build · Format · CLI · LSP · Translate if foo bar += baz end
81. Build · Format · CLI · LSP · Translate if foo bar += baz end
82. Build · Format · CLI · LSP · Translate bar += baz if foo
83. Build · Format · CLI · LSP · Translate if foo bar else baz end
84. Build · Format · CLI · LSP · Translate if foo bar else baz end
85. Build · Format · CLI · LSP · Translate foo ? bar : baz
86. Build · Format · CLI · LSP · Translate here_is_a_method_call(1, 2, <<~HEREDOC this is the content of the heredoc HEREDOC )
87. Build · Format · CLI · LSP · Translate here_is_a_method_call(1, 2, <<~HEREDOC this is the content of the heredoc HEREDOC )
88. Build · Format · CLI · LSP · Translate here_is_a_method_call(1, 2, <<~HEREDOC) this is the content of the heredoc HEREDOC
89. Build · Format · CLI · LSP · Translate def foo return [1, 2, 3].map { |element| element * 2 } # comment end
90. Build · Format · CLI · LSP · Translate def foo return [1, 2, 3].map { |element| element * 2 } # comment end
91. Build · Format · CLI · LSP · Translate def foo return( [1, 2, 3].map do |element| element * 2 end ) # comment end
92. Build · Format · CLI · LSP · Translate class If < Node def format(q) if node.consequent || node.statements.empty? q.group { format_break(q, force: true) } else q.group do q .if_break { format_break(q, force: false) } .if_flat do Parentheses.flat(q) do q.format(node.statements) q.text(" if ") q.format(node.predicate) end end end end end end
93. Build · Format · CLI · LSP · Translate class If < Node def format(q) if node.consequent || node.statements.empty? q.group { format_break(q, force: true) } else q.group do q .if_break { format_break(q, force: false) } .if_flat do Parentheses.flat(q) do q.format(node.statements) q.text(" if ") q.format(node.predicate) end end end end end end
94. Create a CLI Build · Format · CLI · LSP · Translate
95. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
96. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
97. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
98. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
99. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
100. Plugins Build · Format · CLI · LSP · Translate
101. Formatting plugins Build · Format · CLI · LSP · Translate
102. Single quotes Formatting plugins Build · Format · CLI · LSP · Translate
103. Single quotes Trailing commas Formatting plugins Build · Format · CLI · LSP · Translate
104. Language plugins Build · Format · CLI · LSP · Translate
105. Language plugins Build · Format · CLI · LSP · Translate rbs
106. Language plugins Build · Format · CLI · LSP · Translate rbs haml
107. Language plugins Build · Format · CLI · LSP · Translate rbs haml json
108. Language plugins Build · Format · CLI · LSP · Translate rbs haml json xml
109. Language plugins Build · Format · CLI · LSP · Translate rbs haml json xml css
110. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
111. Build · Format · CLI · LSP · Translate stree ast [OPTIONS] [FILE] Print out the AST corresponding to the given files stree check [OPTIONS] [FILE] Check that the given files are formatted as syntax tree would format them stree debug [OPTIONS] [FILE] Check that the given files can be formatted idempotently stree doc [OPTIONS] [FILE] Print out the doc tree that would be used to format the given files stree format [OPTIONS] [FILE] Print out the formatted version of the given files stree json [OPTIONS] [FILE] Print out the JSON representation of the given files stree match [OPTIONS] [FILE] Print out a pattern-matching Ruby expression that would match the given files stree help Display this help message stree lsp Run syntax tree in language server mode stree version Output the current version of syntax tree stree write [OPTIONS] [FILE] Read, format, and write back the source of the given files
112. Create a language server Build · Format · CLI · LSP · Translate
113. Language server protocol Build · Format · CLI · LSP · Translate
114. Language server protocol Runs a JSON RPC server behind an editor Build · Format · CLI · LSP · Translate
115. Language server protocol Runs a JSON RPC server behind an editor textDocument/didChange textDocument/didOpen textDocument/didClose Build · Format · CLI · LSP · Translate
116. Language server protocol Runs a JSON RPC server behind an editor textDocument/didChange textDocument/didOpen textDocument/didClose textDocument/formatting Build · Format · CLI · LSP · Translate
117. Language server protocol Runs a JSON RPC server behind an editor textDocument/didChange textDocument/didOpen textDocument/didClose textDocument/formatting textDocument/inlayHint Build · Format · CLI · LSP · Translate
118. Build · Format · CLI · LSP · Translate
119. Shopify/ruby-lsp Build · Format · CLI · LSP · Translate
120. Shopify/ruby-lsp Document highlight Build · Format · CLI · LSP · Translate
121. Shopify/ruby-lsp Document highlight Document symbols Build · Format · CLI · LSP · Translate
122. Shopify/ruby-lsp Document highlight Document symbols Folding ranges Build · Format · CLI · LSP · Translate
123. Shopify/ruby-lsp Document highlight Document symbols Folding ranges Formatting Build · Format · CLI · LSP · Translate
124. Shopify/ruby-lsp Document highlight Document symbols Folding ranges Formatting Selection ranges Build · Format · CLI · LSP · Translate
125. Shopify/ruby-lsp Document highlight Document symbols Folding ranges Formatting Selection ranges Semantic highlighting Build · Format · CLI · LSP · Translate
126. Translate the syntax tree Build · Format · CLI · LSP · Translate
127. Translate the syntax tree Build · Format · CLI · LSP · Translate
128. Translate the syntax tree seattlerb/ruby_parser Build · Format · CLI · LSP · Translate
129. Translate the syntax tree seattlerb/ruby_parser whitequark/parser Build · Format · CLI · LSP · Translate
130. Translate the syntax tree seattlerb/ruby_parser whitequark/parser rubocop/rubocop-ast Build · Format · CLI · LSP · Translate
131. Translate the syntax tree seattlerb/ruby_parser whitequark/parser rubocop/rubocop-ast ruby-syntax-tree/ 
 syntax_tree-translator Build · Format · CLI · LSP · Translate
132. Thank you!
133. Syntax Tree github.com/ruby-syntax-tree Kevin Newton @kddnewton